On expert review, reviewers generally carry out discussion via private mailing lists (anybody can subscribe to them, but only reviewers and coordinators can post on them). This is done for three reasons:

Anybody can subscribe to any of the lists. Only reviewers and coordinators can post on the reviewers' mailing lists (which are not moderated), but anybody can post on the coordinators' mailing list (which is moderated).

Mailing lists

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Mailing list Description Subscribe access Post access Moderated
enwp-expertreview-coordinators@lists.wikimedia.org General mailing list for coordinators All All Yes
enwp-expertreview-reviewers@lists.wikimedia.org General mailing list for reviewers All Reviewers, coordinators No
enwp-expertreview-reviewers-maths@lists.wikimedia.org Mathematics mailing list for reviewers All Reviewers, coordinators No
enwp-expertreview-reviewers-compsci@lists.wikimedia.org Computer science mailing list for reviewers All Reviewers, coordinators No
enwp-expertreview-reviewers-chemistry@lists.wikimedia.org Chemistry mailing list for reviewers All Reviewers, coordinators No
enwp-expertreview-reviewers-physics@lists.wikimedia.org Physics mailing list for reviewers All Reviewers, coordinators No